Do Download Reports Reliably Measure Journal Usage? Trusting the Fox to Count Your Hens?

« Download rates of academic journals have joined citation counts as commonly used indicators of the value of journal subscriptions. While citations reflect worldwide influence, the value of a journal subscription to a single library is more reliably measured by the rate at which it is downloaded by local users. If reported download rates accurately measure local usage, there is a strong case for using them to compare the cost-effectiveness of journal subscriptions. We examine data for nearly 8,000 journals downloaded at the ten universities in the University of California system during a period of six years. We find that controlling for number of articles, publisher, and year of download, the ratio of downloads to citations differs substantially among academic disciplines. (…) »